[BUG] DROP INDEX syntax failed error message is misleading

[penghuo]

What is the bug? Error message is misleading

"{\n  \"status\": 404,\n  \"error\": {\n    \"type\": \"IndexNotFoundException\",\n    \"reason\": \"There was internal problem at backend\",\n    \"details\": \"no such index [flint_glue_table_skipping_index]\"\n  }\n}"

How can one reproduce the bug?

POST /_plugins/_async_query
{
  "datasource": "glue",
  "lang": "sql",
  "query": "DROP SKIPPING INDEX on TABLE glue.default.status_2024_partitioned"
}